Sand-packing device used in foundry-molding



L. M. AND A. G. ANDERSON. SAND PACKING DEVICE USED m FOUNDRY MOLDING.

APPLICATION FILED JUNEZ], 1920. 1,3603996. 5 I Patented Dec. 7, 1920.

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IIPI'LICATION FILED JUNE 2|, I920.

Patented Dec. 7, 1920.

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v APPLICATION FILED JUNE 21,1920. 1,360,996, Patented Dec. 7, 1920.

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LABS MAGNU'S ANDERSON AND AUGUST Gr. ANDERSON OF S1. PAUL, MINNESOTA.

SAND-PACKING- DEVICE USED IN FOUNDRY-MOLDING.

Specification of Letters Patent. Patented De a lication filed .l'une 21, 1920. Serial No. 390,533.

To all whom it may concern:

Be it known thatv we, LARS M. ANDERSON and AUGUST G. ANDERSON, citizens of the United States, residing at St. Paul, county of Ramsey, State of Minnesota, have invented an Improvement in Sand-Packing Devices Used in Foundry-Molding, of which the following description, in connection with the accompanying drawings, is a specification, like characters on the drawing re resenting like parts.

his invention is particularly adapted for use in the formation of the usual sand molds in flasks employed in the molding art. At present, there are three well-known methods in commercial use: one, in which the sand is placed in the flask and manually tamped; another, in which the sand is placed in th flask and the whole flask is vibrated; and another, in which the sand is thrown into the flask by means of a rotating disk carrying a peripheral paddle. Hence, the idea" of forcibly projecting the packing sand into the mold is not novel so far as this improvement is concerned. This improved device provides means for projecting a steady, easily directible stream of sand into the flask and effects such result through the novel provision of two cooperable endless conveyer members, one of which travels relatively to the other so that any sand lumps are reduced before being projected from the device into the flask. Furthermore, the device is so actuated thatduring any given operation the molding sand is projected into the flask more forcibly toward the end offthe operation than at the beginning. a

The object, therefore, of this invention is to provide a new and improved sand-packing device for foundry molding. Other objects of the invention will more fully appear from the following description and the accompanying drawings and. will be ointed out in the annexed claims.

11 the accompanying-drawings, there is disclosed a structuredesigned to carry out I the objects of the invention, but it is under-.

which follow may be made within the In the drawings, Figure lis a front vice; Y

The conveyer members ,1...aara 1a.; a.

Fig. 2 is a section on the line 22 of Fig. 1. orthe purpose of full disclosure of this nvention, this selected embodiment thereof is shown and described. It consists broadly of a sand-receiving hop er adapted to discharge the molding Sandi between two chute or convey-er members. While one of these members may be stationary and the other member moved relatively to the first-men tioned, so that the sand not only may be forcibly projected but also any lumps reducedy before projection therefrom, it is preferable to actuate both members, one preferably traveling at a greater 2 rate of speed than the other. Specifically, in this preferred construction, two endless, flexible belt conveyers are uitably mounted so as to present two adjacent opposed conveyer surfaces which travel in the same direction. are adjustably mounted so'that the interval between the opposed surfaces may be increased or diminished as desired. I

The device here showncomprises a hopper 1 preferably formed integrally with the frame 2 which extends below the hopper and is bifurcated to provide legs 3' and 4 between which are mounted, in suitable bearings, the shafts 5 and 6 of the upper and lower pulleys 7 and 8 over which travels the conveyer member 9. Each of be supported'by means of arms 10 and 11. f

The terminal portion of. the upper arm 10, is suitably secured within a boss 12 formed on, the hopper portionof the frame, while: the lower arm 11 is similarly secured v to'a boss '13. on one .of the frame legs.

The

other terminal portion of each of these arms 15 respectively presented by'sleeves 1.6 and-j 17' carried-by the standardi-B 1" 10 and 11 are 'securedwithin bosses 14:an'd

The. standardwl8-y. also provides a l venient mounting for. the means for the actuation Ofeachcf the drivenpulley shafts 5 and-25, which is here diagrammatically/ tioned within the permissive limits of the v shown as an electric motor 19, the rotor of which drivesa pulley through a suitable prolongation of its shaft. Two such electric motors'19 are preferably provided, one to drive each of the shafts of the two upper pulleys 7 and 23 of the device. These motors are alike, similarly mounted on opposed sides of the standard 18 and, as the ordinary type may be employed which is capable of working at various speeds, it is 'not deemed necessary to indicate two. While other driving means may be provided, ithas been found that the provision of an individual motor for eachupper pulley shaft is most simple and effective as not only are the two pulleys and therefore conveyers preferably driven at different rates of speed, but also the linear rates ofspeed of the conve ers is increased as the particular-flask is bemg filled. This speed increase effects the more firm packing of the molding sand in the flask as the flask becomes filled.

' In order that slack may be easily taken up in the endless conve er, the lower end 0 each frame leg is for ed and a bearingbox 20 is adj ustably supported therein. Adjustment of the bearing-box is attained by means of the screw 21.

The other conveyer member 22 travels over the upper and lower pulleys 23 and. 24. A bearing for the shaft 25 of the upper pulley 23 is provided by two bearing brackets 26, one on each side of the pulley. This shaft 25 is shown in Fig. 3, as broken, and its prolongation actuable by the motor 19.

Each bracket 26 is secured by bolts 27 to one of the projecting flanges 28 of the frame adjacent the hopper. In order that the upper pulley 23 may be adjusted toward and from the upper pulley 7, the flanges 28 are provided with elongated apertures or slots so that the brackets maybe adjustably posielongated slots 30in the flanges through which are passed'the bolts 27. Nuts 31 on the bolts maintain the brackets in positioned relation to the flanges 28.

In this preferred construction the four pulleys are so mounted that the adjacently presented working surfaces of the two conveyers are downwardly inclined toward each other. In other words, the spaced interval between the two conveyer surfaces as they forcibly eject the sand from the device is less than the spaced interval between the surfaces as they converge after passing over their respective upper pulleys, i. e., the points at which the sand is fed from the hopper. Being closer together at the lower pulleys, one of these pulleys is preferably mounted'so that it is resiliently held in its adjusted spaced relation. The shaft 32 of the'lower pulley 24 is carried in bearing boxes 34, similar to the bearing boxes of the adjacent lower pulley 8.

Thesebearing boxes 34 are mounted in the forked ends 35 of two legs 36 which are apertured at their upper ends to receive therethrough the shaft 25 of the upper pulley 23. These two legs are substantially suspended from the shaft 25 and the two opposed legs 36 are therefore arcuately movable. In order that the lower pulley may be held in the desired spaced relation to the adjacent pulley, a spacing means is provided on each side of the legs 36. These spacing means are alike, and but one is necessary therefore to be described. A rod 37 is terminally aflixed to each frame leg. Each rod has an intermediate threaded portion upon which is, re- .ceived in threaded engagement a nut 38. A boss-39 is formed on the leg 36 and is adapted to receive the rod '37 therethrough with a running fit. A spring 40 is coiled about the rod and abuts at one end against this boss 39 and abuts at its outer end against a washer 41 held on .the outer threaded portion of the rod by means of the nut 42.

L adjusted by movement of the nut 42.

he tension of the spring, resistant eans are provided to prevent the escape i of sand tranversely of the two conveyers. To this end the longitudinal edges of the opposed working surfaces of the conveyers are substantially closed. This is preferably effected by the guards formed of sheet metal. One pair of guard members 44 is carried by a the frame 2 and legs 3 and 4, being secured thereto by screws 45. These guard members 44 are provided with offset portions 46 (see Fig. 2) along their inner longitudinal edges adjacent the space between the opposed conveye'r faces. The guard members 47 are similarly secured by screws 48 to the legs 36 and their inner-longitudinal edges extend beneath the offset portions 46. The outer edge portions of all guard members extend beyond the edge portions of the conveyers in order-to protect the operatives from the moving parts of the device and to provide a means for attachment of the usual safety apgliances in accordance with Federal and tate laws.

In order that the opposed working surfaces of the conveyers may not recede from each other a backing plate 49 is mounted be-.

hind each conveyer sothat the conveyer surfaces cannot, during working travel, separate more than the spaced interval predetermined by the two opposed backing plates 49.-

These plates are secured, as shown in Fig. 4,

by means of the angle brackets 50 to the respectively adjacent guards.

This device is preferably operated in a perpendicular osition and is adapted to be moved over a ask 51, diagrammatically indicated in Fig. 4, forcibly to project the packing sand therein. Sand is conveyed to the hopper and is fed by gravity between the conveyers which are preferably actuated, as by electric motors, so that one conveyer is moving relatively to the other. When one conveyer travels at a greater linear rate of speed than the other, a frictional action is produced which functions to reduce lumps in the packing sand before it is forcibly projected from the device to the flask. The resilient mounting of the lower pulley 24 of the conveyer 22 permits'the passage of unreduced objects without injury to the device.

There is thus provided a novel, eflicient and high-speed sand-packing device which is easy to operate and is of simple and inexpensive construction and may be efficiently operated by others than the highly skilled sand-molders.

Having thus described our invention, what we claim as new and desire to secure by Letters Patent is:

1. A sand-packing device including opposed conveyer members cooperable to project sand fed therebetween, one of which members is movable relative to the other whereby sand lumps may be reduced before projection, and means to actuate said movable member whereby the sand is forcibly projected.

2-. A sand-packing device including a pair of movable, opposed conve er members cooperable to project sand ed therebetween into a molding flask, and means to actuate said members at increasing speeds during sand projection whereby sand is more firmly packed in said flask toward the end of a given operation than at the beginning.

3. A sand-packing device including a pair of movable conveyer members having adjacent opposed surfaces adapted to move in the same direction and cooperable to project sand fed therebetween, and means to actuate both said members, one of which members is actuable at a greater rate of speed than the other whereby sand lumps may be frictionally reduced before projection.

In witness whereof, we have hereunto set our hands this 16th day of June, 1920.

LARS MAGNUS ANDERSON, AUGUST G. ANDERSON. Vitnesses L. J. CoLnIN,

JENNIE OLIN. 

